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03-21-2017 12:05 PM

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  • Posted in thread: Spam on 02-11-2017 at 02:39 PM
    Is anyone else getting spam messages on this site? I seem to be getting one a day starting
    yesterday.Lohring Miller

  • Posted in thread: 2-Stroke Design: Port Timing Round 2 on 02-06-2017 at 07:42 PM
    Low cost industrial engines use the porting system pictured below. The slugs in the pictures
    are guides for port modifications. The widths, angles, and timing are important. I can provide
    details if y...

  • Posted in thread: PatWankel Rotary Engine on 02-04-2017 at 02:55 PM
    I think you are on the right track, but making the seal "rings" with enough precision will be
    challenging. I still think the problem area will be where the spherical outer surface
    transitions to the f...

  • Posted in thread: PatWankel Rotary Engine on 01-24-2017 at 01:20 PM
    That will work with both cutting tools and a grinder mounted like common ball cutters. The next
    problem is machining the seal slots in the outer body. To follow the inner body their location
    and conto...

  • Posted in thread: PatWankel Rotary Engine on 01-12-2017 at 12:11 PM
    Thanks. For some reason I didn't realize that the seals were in the outer case. However,
    everything I said about an accurate and smooth surface is still true. It just needs to be on
    the inner element....

  • Posted in thread: Timing for SI 2-stroke? on 01-12-2017 at 12:01 PM
    QUB is Queens University of Belfast. The late Gordon Blair did a lot of the basic research
    there that lead to the modern two stroke design. Unlike most two stroke developers, he
    published his work and...

  • Posted in thread: Timing for SI 2-stroke? on 01-11-2017 at 04:15 PM
    This may be a little late, but a better design for a cross flow scavenged engine is the QUB
    crossflow design. It has a better combustion chamber shape and should be easier to
    build.Lohring Miller

  • Posted in thread: PatWankel Rotary Engine on 01-11-2017 at 12:49 PM
    I doubt that milling will leave an accurate and smooth enough surface on the outer case to get
    good sealing. However, a CNC grinding machine should be able to produce an accurate surface in
    the same w...

  • Posted in thread: PatWankel Rotary Engine on 01-10-2017 at 02:27 PM
    Fascinating. The problem with the Wankel, Liquid Piston, and similar concepts has always been
    sealing. Their designs were 2D concepts that could be made accurately with 20th century
    methods. However, ...

  • Posted in thread: piston ring materials on 12-03-2016 at 03:23 PM
    I got the very small amount of ductile cast iron I needed from McMaster-Carr. While I'm just
    starting to make rings, the machining process seems to go very well. The usual recommendation
    is Meehanite,...


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